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Table 4 Modeling of the BrainLAB imaging couch top (ICT) in the Philips Pinnacle 3 treatment planning system using different combinations of carbon fibers (CF) and foam densities (F) for 5 cm × 5 cm field size

From: A validation of carbon fiber imaging couch top modeling in two radiation therapy treatment planning systems: Philips Pinnacle3 and BrainLAB iPlan RT Dose

  Percentage Deviation of the Treatment Planning System Predicted Dose to Measured Dose
Angle Measured Dose (cGy) No Couch CF0.6 CF0.5 CF0.46, CF0.46 CF0.6 CF0.55 CF0.7
    F0.02 F0.03 F0.5 F0.1 F0.1 F0.03 F0.1
180 81.2 1.84 -0.99 -0.13 -0.75 -1.86 -2.96 -0.50 -3.21
170 80.8 1.80 -1.04 -0.30 -0.92 -1.91 -3.02 -0.67 -3.39
160 79.7 2.19 -0.94 -0.07 -0.82 -1.82 -2.95 -0.57 -3.33
150 77.5 2.71 -0.39 0.51 -0.26 -1.55 -2.71 0.13 -3.10
140 74.0 3.66 -0.40 0.68 -0.13 -1.62 -3.10 0.14 -3.51
130 68.3 5.24 0.12 1.29 0.26 -1.35 -3.10 0.70 -3.69
120 59.2 7.90 1.14 2.66 1.31 -0.88 -3.08 1.82 -3.75
110 50.0 6.51 -1.28 0.52 -0.08 -1.28 -3.68 -0.48 -4.48
100 56.0 -1.15 -1.15 -1.15 -1.15 -1.15 -1.15 -1.15 -1.15
sum   30.69 -4.95 4.01 -2.54 -13.42 -25.77 -0.59 -29.62
t-test   0.002 0.047 0.23 0.21 0.00004 0.000005 0.76 0.000005
  1. Note that the “measured dose (cGy)” is the dose measured as described in section “Phantom dose measurement” through the imaging couch top.